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Mike Turitzin

@miketuritzin • 7,641 subscribers

Building a game/engine based on signed distance fields ~ Past: rendering lead @figma, indie VR dev, founder @workflowy, search backend @ Google, Quake modder

Shorts

Kind of obvious when you think about it, but it was cool to realize that I don't need to record position history to draw artillery trails, as the same closed-form trajectory equation can be used to "rewind time" for each shot to generate its trail positions.

Kind of obvious when you think about it, but it was cool to realize that I don't need to record position history to draw artillery trails, as the same closed-form trajectory equation can be used to "rewind time" for each shot to generate its trail positions.

117,700 次观看

Playing around with a "tunnel gun" that can open a tunnel in front of you that can be looked into or moved through. This type of thing is really simple in my engine - just spawn an SDF capsule subtraction that is locked to the player's view.

Playing around with a "tunnel gun" that can open a tunnel in front of you that can be looked into or moved through. This type of thing is really simple in my engine - just spawn an SDF capsule subtraction that is locked to the player's view.

282,241 次观看

Experimenting with a SDF material blend function that is "stamps" the material volumetrically. The previous function I was using (which is the common one) blends the material around the surface influence area, and so would have no effect below ground.

Experimenting with a SDF material blend function that is "stamps" the material volumetrically. The previous function I was using (which is the common one) blends the material around the surface influence area, and so would have no effect below ground.

154,254 次观看

Something that just clicked for me - In the same way that dividing by distance-to-origin (L2 norm) projects a point onto the unit circle/sphere: Dividing by L1 norm projects onto the unit diamond/octahedron Dividing by L-infinity norm projects onto the unit square/cube cont.

Something that just clicked for me - In the same way that dividing by distance-to-origin (L2 norm) projects a point onto the unit circle/sphere: Dividing by L1 norm projects onto the unit diamond/octahedron Dividing by L-infinity norm projects onto the unit square/cube cont.

25,848 次观看

I'm close to finishing a major rework of how materials are baked in my engine. Rather than baking material properties directly, I now store a material palette per brick and bake blend weights. This means that material property blending is "deferred" to render-time, ... 1/

I'm close to finishing a major rework of how materials are baked in my engine. Rather than baking material properties directly, I now store a material palette per brick and bake blend weights. This means that material property blending is "deferred" to render-time, ... 1/

20,949 次观看

Cleaning up SDF physics objects with a portable hole. Oddly satisfying.

Cleaning up SDF physics objects with a portable hole. Oddly satisfying.

108,246 次观看

I too use the sphere making algorithm

I too use the sphere making algorithm

67,316 次观看

Metallic materials are now officially supported in my engine. Previously, I hacked this for some videos by interpreting inverse "roughness" as "metallic", but obviously that isn't a great long-term solution :)

Metallic materials are now officially supported in my engine. Previously, I hacked this for some videos by interpreting inverse "roughness" as "metallic", but obviously that isn't a great long-term solution :)

38,349 次观看

Prowling around the SDF yards after dark, desecrating spheres with reckless abandon.

Prowling around the SDF yards after dark, desecrating spheres with reckless abandon.

35,847 次观看

Sparse allocation/rendering of SDF bricks is now working! The pipeline is fully GPU-driven - a series of compute shaders that manages brick allocation/baking in a 3D texture atlas, followed by draw-indirect for rendering. Still a lot more work to do, including automatic LOD.

Sparse allocation/rendering of SDF bricks is now working! The pipeline is fully GPU-driven - a series of compute shaders that manages brick allocation/baking in a 3D texture atlas, followed by draw-indirect for rendering. Still a lot more work to do, including automatic LOD.

39,022 次观看

Got the BVH (AABB tree) working with a nice visualization. (The circles and arrows show the hierarchy of the tree.) This is all CPU-side for now, so next is to ship the BVH to the GPU for accelerating SDF brick baking. It's already in a flat buffer so that is straightforward.

Got the BVH (AABB tree) working with a nice visualization. (The circles and arrows show the hierarchy of the tree.) This is all CPU-side for now, so next is to ship the BVH to the GPU for accelerating SDF brick baking. It's already in a flat buffer so that is straightforward.

36,134 次观看

Increased the number of octaves of noise in the terrain gen function, and it's pretty mesmerizing just watching a cube smoothly blend with the terrain.

Increased the number of octaves of noise in the terrain gen function, and it's pretty mesmerizing just watching a cube smoothly blend with the terrain.

22,771 次观看

This article is a great dive into the nuts and bolts of creating one of those tiny (but neat) shaders. Both in terms of algorithms and GLSL character minimization!

This article is a great dive into the nuts and bolts of creating one of those tiny (but neat) shaders. Both in terms of algorithms and GLSL character minimization!

13,248 次观看

Ran across this great article on sampled SDFs that has *great* interactive WebGL illustrations that work really well for building intuition on how this works. This technique works for SDF-based text rendering or baking of 3D geometry like in my project.

Ran across this great article on sampled SDFs that has great interactive WebGL illustrations that work really well for building intuition on how this works. This technique works for SDF-based text rendering or baking of 3D geometry like in my project.

17,843 次观看

Tracing a ray against the BVH and highlighting the leaves that are tested. (This is an "any hit" test for demonstration purposes! Next vid is shows closest-hit raycast.)

Tracing a ray against the BVH and highlighting the leaves that are tested. (This is an "any hit" test for demonstration purposes! Next vid is shows closest-hit raycast.)

18,486 次观看

Videos

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Experimenting with strong materials that can't be dug through using normal tools. Gameplay ideas: - block player movement, making underground navigation more complex - enclose special resources that need to be extracted using explosives or other means

Experimenting with strong materials that can't be dug through using normal tools. Gameplay ideas: - block player movement, making underground navigation more complex - enclose special resources that need to be extracted using explosives or other means

140,676 次观看 • 6 个月前

At long last, SDF material textures are supported in my engine! I've decided to go for a textural and slightly hand-painted look. Currently using color and normal maps, might consider roughness as well. 1/

At long last, SDF material textures are supported in my engine! I've decided to go for a textural and slightly hand-painted look. Currently using color and normal maps, might consider roughness as well. 1/

22,321 次观看 • 26 天前

Experimenting with having enemies turn to full rigid bodies when damaged and then recover after bouncing around. It's pretty entertaining how they pop back up.

Experimenting with having enemies turn to full rigid bodies when damaged and then recover after bouncing around. It's pretty entertaining how they pop back up.

54,933 次观看 • 3 个月前

It is now possible to vomit (SDF) cubes in my engine! This video shows the "sticky" mode first, which is satisfying with smooth blends, followed by the "dynamic body" mode.

It is now possible to vomit (SDF) cubes in my engine! This video shows the "sticky" mode first, which is satisfying with smooth blends, followed by the "dynamic body" mode.

76,236 次观看 • 1 年前

Experimenting with "digging" using rotated cubes as the subtraction primitive instead of spheres. I like the jagged/angular/detailed look, but I'm going to try other shapes (like tetrahedron or pyramid) that aren't all right angles.

Experimenting with "digging" using rotated cubes as the subtraction primitive instead of spheres. I like the jagged/angular/detailed look, but I'm going to try other shapes (like tetrahedron or pyramid) that aren't all right angles.

45,203 次观看 • 1 年前

The beginnings of prototyping digging/mining gameplay. Resources are embedded in the ground and are dislodged when the surface is cut away. They're placed in colored regions that reveal their proximity. Lots of different directions to go with this, continuing to experiment!

The beginnings of prototyping digging/mining gameplay. Resources are embedded in the ground and are dislodged when the surface is cut away. They're placed in colored regions that reveal their proximity. Lots of different directions to go with this, continuing to experiment!

23,262 次观看 • 6 个月前

First version of underground "biomes". They're currently defined by distance to the terrain surface. The idea is that different biomes have different resources, obstacles, caves, etc. The bottom one is very dark🤠 [cont]

First version of underground "biomes". They're currently defined by distance to the terrain surface. The idea is that different biomes have different resources, obstacles, caves, etc. The bottom one is very dark🤠 [cont]

16,023 次观看 • 5 个月前

Finished implementing diffuse and specular image-based ambient lighting, and things are looking a lot nicer. This is still without any shadows or AO, so that's next! I also switched to using ACES for tonemapping, which is similar to what I had before but seems a bit nicer.

Finished implementing diffuse and specular image-based ambient lighting, and things are looking a lot nicer. This is still without any shadows or AO, so that's next! I also switched to using ACES for tonemapping, which is similar to what I had before but seems a bit nicer.

33,333 次观看 • 1 年前

It's still kinda wild to me how much tweaking the easing function changes the feel of what kind of materials and tools you're working with. This video demonstrates "quintic" vs. "elastic" vs. none. The easing function controls the scale of the SDF subtraction.

It's still kinda wild to me how much tweaking the easing function changes the feel of what kind of materials and tools you're working with. This video demonstrates "quintic" vs. "elastic" vs. none. The easing function controls the scale of the SDF subtraction.

10,541 次观看 • 4 个月前

Herding cubes.

Herding cubes.

26,638 次观看 • 1 年前

Demo of bilinear interpolation of SDF samples: - Negative (interior) samples of the analytic SDF are blue, positive (exterior) samples are orange. - Circles are drawn around samples to show distance magnitude. - Intermediate bilinear interp samples / segments are drawn. 1/

Demo of bilinear interpolation of SDF samples: - Negative (interior) samples of the analytic SDF are blue, positive (exterior) samples are orange. - Circles are drawn around samples to show distance magnitude. - Intermediate bilinear interp samples / segments are drawn. 1/

16,357 次观看 • 10 个月前

I built a sculpture for Burning Man.

I built a sculpture for Burning Man.

11,094 次观看 • 6 个月前

My foes when I confront them

My foes when I confront them

14,650 次观看 • 10 个月前

Got SDF collision mesh generation (via marching cubes) working with Jolt Physics! The collision mesh is regenerated when the SDF scene changes. Individual SDF primitives can be made "dynamic", which adds them as physics objects. 1/

Got SDF collision mesh generation (via marching cubes) working with Jolt Physics! The collision mesh is regenerated when the SDF scene changes. Individual SDF primitives can be made "dynamic", which adds them as physics objects. 1/

10,942 次观看 • 1 年前

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